I know I'm attracted to girls. I'm not too sure if I like boys. When I was twelve I noticed I was attracted to girls. I didn't like boys "that way", but I did know what boys were cute. I pretended to like boys until I was fourteen. When I was fourteen I was getting ready to come out as a lesbian. I watched a bit of porn and lesbian porn didn't turn me on. I tried watching gay and straight porn for fun and I only got turned on by gay porn. After that I started to get attracted to guys for real and I went through short periods of only liking boys. I thought I was straight for a bit. My sexuality continued to fluctuate. Right now I mostly like girls. I do get attracted to guys once in a while, but I don't find as many guys attractive. I'm starting to find guys less attractive. When I like guys it feels the same physically, but it doesn't feel as natural. Is my sexuality stabilizing or am I just going through a "gay phase" right now?
Most lesbians do not like "lesbian" porn that is made for straight men. It is very common for lesbians to prefer gay male porn to any porn made for straight guys, because what straight guys think is sexy in terms of what they have women do is so profoundly unsexy. If your main reason for thinking you liked guys was that you enjoyed gay male porn, I think it's safe to say you are a lesbian.
I think I like guys because I occasionally get attracted to them in the real world. I also have a crush on a male teacher right now. The reason I'm questioning whether I like boys or not is because I didn't have any interest in boys before I watched gay porn. I had a boyfriend at fourteen and I liked holding his hand and cuddling with him, but I didn't really like kissing him. He broke up with me because of that. I'm not sure if that happened because I don't like boys or I don't like him. I guess I'll have to date more guys to find out. Another thing is I can't "finish up" when I try to fantasize about being with a guy. I know that I don't like guys as much as the average straight girl.